Fix indicator's position when contentSize < viewSize
Fix indicator's position when contentSize < viewSize

Kianoosh76/UIScrollView-InfiniteScroll,pronebird/UIScrollView-InfiniteScroll,pronebird/UIScrollView-InfiniteScroll,brightsider/UIScrollView-InfiniteScroll,jmkr/UIScrollView-InfiniteScroll,colinhumber/UIScrollView-InfiniteScroll,jmkr/UIScrollView-InfiniteScroll,brightsider/UIScrollView-InfiniteScroll,Kianoosh76/UIScrollView-InfiniteScroll,colinhumber/UIScrollView-InfiniteScroll,pronebird/UIScrollView-InfiniteScroll,Kianoosh76/UIScrollView-InfiniteScroll